Don't mean to sound flip, but how does one do that? I've been on his sites and outside of making a donation I can't find an email, and even if there was one I'd think this would take something like someone who knows someone etc. Even if an email could be sent to someone who knows someone on Trump's campaign this is far too important to use a general email that may or may not be read, let alone stolen or hacked.
Email
https://www.donaldjtrump.com/contact
Contact The Campaign - Tel: 646-736-1779
I have called numerous times. Remember they have a small staff. Totally nationally is less than 80
Some of the materials he has used in speech comes from freepers contact. They listen